CN110104760B - Preparation and application method of calcium/magnesium carbonate powder material modified sulfur light material - Google Patents

Preparation and application method of calcium/magnesium carbonate powder material modified sulfur light material Download PDF

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CN110104760B
CN110104760B CN201910332916.XA CN201910332916A CN110104760B CN 110104760 B CN110104760 B CN 110104760B CN 201910332916 A CN201910332916 A CN 201910332916A CN 110104760 B CN110104760 B CN 110104760B
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calcium
magnesium carbonate
carbonate powder
sulfur
light material
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CN110104760A (en
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李睿华
周立松
罗黎煜
沈思文
关梦莎
王卫
葛志斌
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Nanjing University
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/10—Packings; Fillings; Grids
    • C02F3/101—Arranged-type packing, e.g. stacks, arrays
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/10—Packings; Fillings; Grids
    • C02F3/105—Characterized by the chemical composition
    • C02F3/107—Inorganic materials, e.g. sand, silicates
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/10—Packings; Fillings; Grids
    • C02F3/109—Characterized by the shape
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
    • C02F3/345—Biological treatment of water, waste water, or sewage characterised by the microorganisms used for biological oxidation or reduction of sulfur compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F2003/001—Biological treatment of water, waste water, or sewage using granular carriers or supports for the microorganisms
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Abstract

The invention discloses a preparation method and an application method of a calcium/magnesium carbonate powder material modified sulfur light material, belonging to the technical field of environmental functional materials and sewage treatment. The invention mixes the sulfur and calcium/magnesium carbonate powder, then melts the mixture under the high temperature condition, foams the melted mixture under the stirring condition, and then cools and molds the melted mixture to obtain the light material. The light material prepared by the invention is beneficial to attaching more biomass, improves the utilization rate of microorganisms and improves the pollutant removal rate; furthermore, the method can provide technical support for the sulfur autotrophic denitrification technology to solve the problems of nitrogen and phosphorus removal in the field of sewage treatment.

Description

Preparation and application method of calcium/magnesium carbonate powder material modified sulfur light material
Technical Field
The invention relates to the technical field of environmental functional materials and sewage treatment, in particular to a preparation method and an application method of a calcium/magnesium carbonate powder material modified sulfur light material.
Background
In recent years, water pollution is increasingly serious due to sewage irrigation, nitrogen oxide sedimentation, large-scale use of chemical fertilizers and unreasonable discharge of domestic sewage and industrial wastewater. Nitrogen and phosphorus are main elements causing eutrophication of water bodies, and are one of the key points of sewage treatment. Denitrification is a key process for separating nitrogen from a water body in sewage treatment and has been the research focus of sewage and wastewater treatment. Among them, the sulfur autotrophic denitrification technology is a representative autotrophic denitrification technology, which is originally generated when sewage and wastewater difficult to treat by traditional denitrification are solved, and along with the development of the technology, the sulfur autotrophic denitrification technology has the advantages of no need of additional carbon source, less sludge production, low treatment cost and the like, is gradually called as a low-consumption and high-efficiency technology for removing nutrients in water, and the technical characteristics of the technology are increasingly shown and become a hotspot of research in the current denitrification field.
Sulfur autotrophic denitrification technique utilizes inorganic carbon (e.g., CO)3 2-And HCO3 -Etc.) to complete the denitrification process by taking elemental sulfur, sulfide and reductive sulfur-containing compounds as electron donors. Sulfur autotrophic denitrification techniques can be divided into 3 major classes according to different electron donors: 1) a sulfur autotrophic denitrification technology taking elemental sulfur as a matrix; 2) a sulfur autotrophic denitrification technology taking sulfide as a matrix; 3) a sulfur autotrophic denitrification technology taking reducing sulfur-containing compounds as matrixes. The sulfur-limestone autotrophic denitrification technology has the advantages of high-efficiency denitrification, no need of an external carbon source and the like, and is widely concerned by domestic and foreign scholars. In a traditional sulfur-limestone autotrophic denitrification System (SLAD), limestone and elemental sulfur particles are mixed according to a certain proportion, the limestone is continuously dissolved in the treatment process, so that the reduction of pH is buffered, the SLAD filler is the particles of sulfur and limestone mixed according to a certain volume ratio, and the filler is filled into a reaction filter column for sewage treatment when in use.
However, SLAD suffers from drawbacks such as high effluent hardness and high sulfate content; in addition, limestone is used as a carrier, the solubility of the limestone is limited, and the stability of the provided organic carbon source is low, so that a new sulfur-limestone autotrophic denitrification method needs to be invented, and a new way for sewage treatment is developed.
Through retrieval, the name of the invention is: a trickling filter technique for effectively removing nitrate nitrogen in high-nitrogen and low-carbon environment and a device thereof (patent application No. CN201611151007.9, application date 2016-12-14) firstly lift sewage to the top of the trickling filter device for uniform water distribution, fill a filter layer with a mixed filler of sulfur and limestone, enable the sewage to penetrate the filter layer in an anoxic state, and finally submerge water at the bottom of the filter material. Under the condition of oxygen deficiency, the autotrophic nitrifying bacteria of sulfur can reduce nitrate nitrogen into nitrogen while oxidizing sulfur into sulfate, thereby achieving the purpose of efficiently removing nitrate nitrogen. But the application field of the application is narrow and the processing time is long.
In addition, the name of the invention is as follows: the subsurface flow wetland system (application number: CN201510067571.1, application date: 2015-02-09) for improving the denitrification and dephosphorization effects of the tail water of the sewage plant and avoiding biological blockage comprises a water distribution area, a purification area and a water collection area which are sequentially arranged, wherein a sulfur/limestone mixed matrix, a gravel matrix and a zeolite matrix are sequentially arranged in the purification area from front to back according to the water flow direction. The subsurface flow wetland and the sulfur autotrophic denitrification are combined to remove the nitrate in the inlet water, and simultaneously, the blockage of the subsurface flow wetland system caused by the mass propagation of microorganisms is avoided. However, the sulfur and the limestone used in the application are both granules with larger granularity, have smaller specific surface area, are not beneficial to the attachment and utilization of microorganisms, and can not form a fluidized bed, so that the mass transfer effect is poorer.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to overcome the defects that microorganisms are difficult to attach and the utilization rate is low due to harsh microbial metabolism conditions in a sulfur autotrophic denitrification technology in the prior art, and provides a preparation method and an application method of a calcium/magnesium carbonate powder material modified sulfur light material; furthermore, the method can provide technical support for the sulfur autotrophic denitrification technology to solve the problems of nitrogen and phosphorus removal in the field of sewage treatment.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention relates to a preparation method of a calcium/magnesium carbonate powder material modified sulfur light material.
Preferably, the specific steps are as follows: uniformly mixing sulfur and calcium/magnesium carbonate powder, and then melting at a high temperature to obtain a molten mixture, wherein the high temperature is 115-180 ℃; secondly, foaming the molten mixture under the condition of stirring, wherein the foaming method is physical foaming or chemical foaming; and step three, cooling, forming and granulating the foamed molten mixture to obtain the modified sulfur light material, wherein the cooling and forming comprises wet granulation, steel belt granulation or crushing and granulation after solidification.
Preferably, the mass ratio of the sulfur to the calcium/magnesium carbonate powder material in the first step is 6: 1-1: 3.
preferably, the step two physical foaming is: after preheating, the gas is dispersed in the molten mixture for foaming.
Preferably, in the second step, the foaming agent for chemical foaming comprises an organic foaming agent and an inorganic foaming agent.
Preferably, in the second step, when the mass ratio of the sulfur to the calcium/magnesium carbonate powder is less than 2: 1, selecting physical foaming; when the mass ratio of the sulfur to the calcium/magnesium carbonate powder is more than 4: 1, chemical foaming is selected. The mass ratio of the sulfur to the calcium/magnesium carbonate powder is 2: 1 and 4: 1, either physical or chemical foaming may be selected.
Preferably, the particle size of the calcium/magnesium carbonate powder material
Figure BDA0002038246930000021
The calcium/magnesium carbonate powder material modified sulfur light material has the density of 0.7-2.0 g/cm3The porosity is 10-71%.
The invention relates to a sewage treatment method of a calcium/magnesium carbonate powder material modified sulfur light material.
Preferably, the inoculated microorganisms comprise sludge or microbial inoculum containing sulfur autotrophic nitrifying bacteria.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
(1) according to the preparation method of the calcium/magnesium carbonate powder material modified sulfur light material, sulfur and calcium/magnesium carbonate powder are mixed and then melted at a high temperature, the melted mixture is foamed under a stirring condition, and the melted mixture is cooled and formed to prepare the light material, so that the high mixing of the sulfur and micro-fine calcium/magnesium carbonate is realized, the density of the material is controllable through foaming, and the quality of the material is reduced;
(2) the calcium/magnesium carbonate powder material modified sulfur light material has the density of 0.7-2.0 g/cm3The porosity is 10-71%, and the composite material has the characteristics of large specific surface area, light weight, high reaction activity, easiness in microorganism attachment, slow-release electron donor denitrification and the like, and can be used as a filler of a sewage treatment fluidized bed and a fixed bed reactor.
Drawings
FIG. 1 is a flow chart of a method for preparing a calcium/magnesium carbonate powder material modified sulfur lightweight material according to the present invention;
FIG. 2 is a graph showing the denitrification effect of microorganisms in the batch reactor in example 2;
FIG. 3 is a graph showing the dephosphorization effect of the microorganisms in the batch reactor of example 2.
Detailed Description
The detailed description and exemplary embodiments of the invention will be better understood when read in conjunction with the appended drawings, where the elements and features of the invention are identified by reference numerals.
The structure, proportion, size and the like shown in the drawings are only used for matching with the content disclosed in the specification, so that the person skilled in the art can understand and read the description, and the description is not used for limiting the limit condition of the implementation of the invention, so the method has no technical essence, and any structural modification, proportion relation change or size adjustment still falls within the scope of the technical content disclosed by the invention without affecting the effect and the achievable purpose of the invention. Meanwhile, the terms such as "upper", "lower", "left", "right" and "middle" used in the present specification are for clarity of description only, and are not used to limit the implementable scope, and the relative relationship changes or adjustments may be considered to be within the implementable scope of the present invention without substantial technical changes; in addition, the embodiments of the present invention are not independent of each other, but may be combined.
Example 1
As shown in fig. 1, the preparation method of the calcium/magnesium carbonate powder material modified sulfur lightweight material of this embodiment includes:
step one, uniformly mixing sulfur and calcium/magnesium carbonate powder materials, and melting at a high temperature to obtain a molten mixture. Wherein the mass ratio of the sulfur to the calcium/magnesium carbonate powder material is 6: 1-1: 3, the high temperature is 115-180 ℃, and the particle size of the calcium/magnesium carbonate powder material
Figure BDA0002038246930000041
The calcium/magnesium carbonate powder material with small particle size has larger specific surface area, is beneficial to the attachment and utilization of microorganisms, and has good mass transfer effect;
foaming the molten mixture under the stirring condition, wherein the foaming method is physical foaming or chemical foaming, the stirring condition is that the rotating speed is 100-800 rpm, and the stirring time is 10-30 min, so that bubbles are uniformly dispersed;
the physical foaming method used in this example was: under heating conditions, gas including air, carbon dioxide or nitrogen is dispersed in the molten mixture by physical aeration to foam. Since the molten mixture has a relatively high temperature, if the normal temperature gas is directly dissolved in the molten mixture, the molten mixture is locally supercooled and condensed. To avoid this problem, this example preheats the gas to 50 ℃ or more before dispersing the gas into the molten agglomerates.
It is worth noting that during foam molding, the viscosity of the melt is one of the basic rheological properties, which affects the nucleation and growth of bubbles. Therefore, when the mass ratio of the sulfur to the calcium/magnesium carbonate powder material is less than 2: at 1, sulfur is low in composition, and physical foaming is adopted in this example. When carbon dioxide gas is taken as an example for analysis of the foaming agent, due to the inherent compressibility, density, solvent strength and viscosity of the foaming agent can be adjusted by changes of pressure and temperature, and physical foaming is selected to reduce the viscosity of the molten mixture, so that the molten polymer can be well foamed and molded.
Conversely, when the mass ratio of the sulfur to the calcium/magnesium carbonate powder material is more than 4: 1, chemical foaming is adopted. The chemical foaming agent in this embodiment includes an organic foaming agent and an inorganic foaming agent, and further, the preferred chemical foaming agent in this embodiment is sodium bicarbonate. In the chemical foaming process, 95% by mass of calcium/magnesium carbonate powder material is firstly added into molten sulfur for high-temperature melting, then the remaining 5% by mass of calcium/magnesium carbonate powder material is firstly mixed with sodium bicarbonate to obtain a mixture, and then the mixture is added into the molten sulfur for high-temperature melting and foaming. Compare in the density of sulphur, sodium bicarbonate's density is lighter, if add sodium bicarbonate after all carrying out high temperature melting with sulphur and calcium/magnesium carbonate powder and carry out chemical foaming, can cause partial sodium bicarbonate to float at the upper surface of melting mixture, make sodium bicarbonate can't thoroughly act on melting mixture, and then cause the influence to the foaming effect, both influenced light material's density, also make the bubble dispersion inhomogeneous, the embodiment makes corresponding improvement to this, the problem production of foaming inequality has been avoided. In addition, when the mass ratio of the sulfur to the calcium/magnesium carbonate powder material is between 2: 1 and 4: 1, both physical and chemical foaming can be used.
Step three, cooling, forming and granulating the foamed molten mixture to obtain the light material, wherein the density of the light material prepared by the embodiment is controllable, and is 0.7-2.0 g/cm3The porosity is 10-71%, and the cooling forming comprises wet granulation, steel belt granulation or crushing granulation after solidification. Wherein the wet granulation comprises dripping the molten mixture of foamed siderite and sulfur into water to meltCooling the molten mixture in water for forming; steel belt granulation refers to dripping the foamed siderite and sulfur molten mixture on a steel belt, so that the molten mixture is cooled and formed on the surface of the steel belt, and granulation forming is realized; the step of crushing and granulating after solidification is to melt, cool and solidify the foamed siderite and the sulfur, crush and prepare the granules.
The invention relates to a sewage treatment method of a calcium/magnesium carbonate powder material modified sulfur light material, which comprises the steps of screening the obtained granular light material and filling the screened granular light material into a reactor; and (4) inoculating anaerobic sludge to treat sewage. The specific description is as follows: the method comprises the steps of firstly placing the prepared light material in a sewage treatment reactor, then inoculating microorganisms to form a biological membrane, wherein the inoculated microorganisms comprise sludge or microbial inoculum containing sulfur autotrophic nitrifying bacteria, the sewage treatment reactor comprises a fluidized bed or a fixed bed reactor, pollutants in the sewage are removed through the denitrification reaction of the microorganisms, nitrogen and phosphorus in the sewage can be efficiently removed, a carbon source is not required to be added in the treatment process, and the treatment process is simple.
The invention takes calcium/magnesium carbonate powder as an inorganic carbon source and sulphur as an electron donor to complete the denitrification process, and the specific reaction formula is as follows:
1.10S+NO3 -+0.76H2O+0.40CO2+0.08NH4 +→
0.08C5H7O2N+0.50N2+1.10SO4 2-+1.28H+。
after the sulfur and the calcium/magnesium carbonate powder are mixed according to the proportion, the sulfur is used as an electron donor to remove NO in the sewage3 -the-N, calcium/magnesium carbonate powder is used as an inorganic carbon source and comprises calcium or magnesium carbonate minerals (limestone, calcite, magnesite, dolomite and the like) and light calcium carbonate, and the calcium/magnesium carbonate powder material is continuously dissolved in the treatment process and plays a role in buffering pH reduction.
In the embodiment, the sulfur and the calcium/magnesium carbonate powder are mixed and then melted at a high temperature, then the melted mixture is foamed under the stirring condition, and then the melted mixture is cooled and formed to prepare the lightweight material. The light material prepared by the embodiment has the characteristics of large specific surface area, light weight, high reaction activity, easiness in microorganism attachment, slow-release electron donor denitrification and the like, and can be used as a filler of a sewage treatment fluidized bed and a fixed bed reactor. Under the denitrification action of microorganisms, the filler has a good purification effect on pollutants in water, particularly total nitrogen, and in addition, the preparation method of the embodiment is simple and low in cost.
Example 2
The basic contents of this embodiment are the same as embodiment 1, except that: in this embodiment, sulfur and light calcium carbonate are mixed in a mass ratio of 3: 1, then melting the mixture at a high temperature of 150 ℃, introducing nitrogen into the melted mixture for foaming under the stirring condition of 200-300 rpm, stirring for 20 minutes to uniformly disperse bubbles, finally cooling and forming, and then crushing and granulating to finally obtain the light material, wherein the stirring time is the foaming time. The density of the lightweight material was measured to be 1.86g/cm3The porosity was 25.7%.
In this example, after the prepared lightweight material was crushed, 10g of the porous material to be used was placed in a batch reaction vessel, and 50mL of a material containing 28mg/L NO was added to the batch reaction vessel3 --N、10mg/L PO4 3--P. Then 3.5mL of sulfur autotrophic denitrifying bacteria liquid (the volume of the bacteria liquid accounts for 7 percent of the volume of the wastewater) is added into the batch reaction container, the mixed solution is subjected to nitrogen blowing to remove oxygen, then the mixed solution is covered and sealed for carrying out the denitrification reaction process, the mixed solution is cultured for 15 days at the constant temperature of 28 ℃ in a dark place, and NO in the wastewater is respectively treated for 1 st, 2 nd, 3 rd, 4 th, 6 th and 8 th days3 --N、PO4 3-The P concentration was measured (the measurement data are shown in fig. 2 and 3).
Example 3
The basic contents of this embodiment are the same as embodiment 1, except that: in this embodiment, sulfur and limestone are mixed in a mass ratio of 2: 1, melting the mixture at a high temperature of 145 ℃, then adopting direct physical aeration foaming and mechanical stirring at a rotating speed of 150-200 rpm for 25 minutes to ensure that the gas is generatedThe bubbles are dispersed evenly, and finally, the mixture is crushed and granulated after being cooled and formed. The density of the lightweight material was measured to be 1.91g/cm3The porosity was 25.1%, and a material having an average particle size of 2.7mm was sieved out after crushing as a filler. Filling the filler into a fixed bed reactor, inoculating anaerobic sludge, adding a culture solution, and culturing for 5 days to finish film formation. And (3) introducing water into the reactor, keeping the water retention time for 4 hours by waterpower, keeping the constant temperature at 28 ℃, keeping the temperature away from the sun, and operating for 88d, wherein the average nitrate nitrogen of the water inlet is 29mg/L, the average nitrate nitrogen of the final water outlet is 0.01mg/L, the average phosphate phosphorus of the water inlet is 4.1mg/L, and the average phosphate phosphorus of the final water outlet is 1.31 mg/L.
Example 4
The basic contents of this embodiment are the same as embodiment 1, except that: in this embodiment, sulfur and limestone are mixed in a mass ratio of 6: 1, melting the mixture at a high temperature of 115 ℃, and then foaming by adding a chemical foaming agent sodium bicarbonate, wherein the mass ratio of sulfur to sodium bicarbonate is 100: and 1, mechanically stirring at the rotating speed of 100-150 rpm for 10 minutes to uniformly disperse bubbles, and finally granulating the steel belt. The density of the lightweight material was measured to be 0.7g/cm3The porosity is 71.3 percent, and the method can be used for in-situ treatment of river water bodies.
Example 5
The basic contents of this embodiment are the same as embodiment 1, except that: in this embodiment, sulfur and limestone are mixed in a mass ratio of 1: 3, performing high-temperature melting on the mixture at a high temperature of 180 ℃, then performing direct physical aeration foaming, mechanical stirring at a rotating speed of 800-1000 rpm for 30 minutes to uniformly disperse bubbles, and finally performing wet granulation. The density of the lightweight material was measured to be 2.0g/cm3The porosity was 28.3%, and a material having an average particle size of 3.2mm was sieved out as a filler. Filling the filler into a fixed bed reactor, inoculating anaerobic sludge, adding a culture solution, and culturing for 4 days to finish film formation. Introducing water into the reactor, keeping the temperature constant at 28 ℃ for 7 hours by hydraulic retention, keeping the temperature away from the sun, and operating for 79 days, wherein the average nitrate nitrogen of the water inlet is 28.7mg/L, the average nitrate nitrogen of the final water outlet is 0.01mg/L, the average phosphate phosphorus of the water inlet is 6.2mg/L, and the final water outlet isThe water average phosphate phosphorus was 1.21 mg/L.
Example 6
The basic contents of this embodiment are the same as embodiment 1, except that: in the embodiment, the mass ratio of sulfur to magnesite is 4: 1, performing high-temperature melting on the mixture at a high temperature of 150 ℃, then performing direct physical aeration foaming, mechanical stirring at a rotating speed of 200-250 rpm for 25 minutes to uniformly disperse bubbles, and finally performing crushing and granulation after cooling and forming. The density of the lightweight material was measured to be 1.05g/cm3And the porosity is 54.7%, screening out materials with the average grain diameter of 2.5mm after crushing as fillers, filling the fillers into a fluidized bed reactor, inoculating anaerobic sludge, adding a culture solution, and culturing for 7 days to finish film formation. And (3) introducing water into the reactor, wherein the hydraulic retention time is 4 hours, the water inflow flow rate is 50mL/min, the average nitrate nitrogen of the water inflow is 31.6mg/L, the final average nitrate nitrogen of the water outflow is 0.08mg/L, the average phosphate phosphorus of the water inflow is 1.96mg/L, and the final average phosphate phosphorus of the water outflow is 0.02mg/L in the process of constant-temperature 28 ℃ dark operation 104 d.
The invention has been described in detail hereinabove with reference to specific exemplary embodiments thereof. It will, however, be understood that various modifications and changes may be made without departing from the scope of the invention as defined in the appended claims. The detailed description and drawings are to be regarded as illustrative rather than restrictive, and any such modifications and variations are intended to be included within the scope of the present invention as described herein. Furthermore, the background is intended to be illustrative of the state of the art as developed and the meaning of the present technology and is not intended to limit the scope of the invention or the application and field of application of the invention.

Claims (6)

1. A preparation method of a calcium/magnesium carbonate powder material modified sulfur light material is characterized by comprising the following specific steps:
step one, mixing a mixture of materials in a mass ratio of 6: 1-1: 3, mixing the sulfur and the calcium/magnesium carbonate powder, and then melting at the high temperature of 115-180 ℃ to obtain a molten mixture;
and step two, foaming the molten mixture under the stirring condition, wherein the foaming method is physical foaming or chemical foaming, and when the mass ratio of the sulfur to the calcium/magnesium carbonate powder is less than 2: when 1, adopting physical foaming; when the mass ratio of the sulfur to the calcium/magnesium carbonate powder is more than 4: 1, chemical foaming is adopted, wherein the physical foaming method comprises the steps of dispersing gas into a molten mixture for foaming after preheating, wherein the gas comprises air, carbon dioxide or nitrogen; chemically foamed blowing agents include organic blowing agents and inorganic blowing agents;
and step three, cooling and forming the foamed molten mixture to obtain the light material.
2. The preparation method of the calcium/magnesium carbonate powder material modified sulfur light material according to claim 1, characterized by comprising the following steps: and step three, cooling, forming and granulating the foamed molten mixture to obtain the modified sulfur light material, wherein the cooling and forming comprises wet granulation, steel belt granulation or crushing and granulation after solidification.
3. The preparation method of the calcium/magnesium carbonate powder material modified sulfur light material according to claim 1 or 2, characterized by comprising the following steps: the particle size of the calcium/magnesium carbonate powder material
Figure FDA0002801551450000011
4. A calcium/magnesium carbonate powder material modified sulfur light material is obtained by the preparation method of any one of claims 1 to 3, and is characterized in that: the density of the light material is 0.7-2.0 g/cm3The porosity of the light material is 10-71%.
5. The sewage treatment method adopting the calcium/magnesium carbonate powder material modified sulfur light material as claimed in claim 4, is characterized in that: after the lightweight material is placed in a sewage treatment reactor, microorganisms are inoculated, and pollutants in sewage, including nitrogen and phosphorus, are removed through the denitrification reaction of the microorganisms.
6. The wastewater treatment method according to claim 5, characterized in that: the inoculated microorganisms comprise sludge or microbial inoculum containing sulfur autotrophic denitrifying bacteria.
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